Malicious PDF — malware analysis report

Static analysis result for SHA-256 995871106b455a7f…

MALICIOUS

PDF

70.9 KB Created: 2021-03-16 23:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: aec585ffccea2db5caf78d4e0fe44a18 SHA-1: 35328c98ba2654d01b5aa53e9f17afe2448f4ef8 SHA-256: 995871106b455a7fbbdaa366a878ab80cf7c5fe5739e387e5d14c36be49ab2f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain 'jumiwimov.ru' that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/wix?keyword=solution+concentrations+worksheet PDF link annotation
    • https://zeronifoza.weebly.com/uploads/1/3/4/3/134312515/7bbbcdea287.pdfIn PDF document text
    • http://pitepon.22web.org/56114506305.pdfIn PDF document text
    • http://jofufuzutaki.22web.org/muvagadudenozixawo.pdfIn PDF document text
    • http://jusefaw.22web.org/41294201523.pdfIn PDF document text
    • https://gazavado.weebly.com/uploads/1/3/4/3/134331045/bifojo.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/xowilizexozowepemo.pdfIn PDF document text
    • https://cdn.sqhk.co/jorubili/Uhijbha/nunuvelabof.pdfIn PDF document text
    • http://dinejokudino.22web.org/43363595863.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/jhagyjg/59729242646.pdfIn PDF document text
    • https://dekajemo.weebly.com/uploads/1/3/1/4/131453049/zavisalojojixow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/bakuti.pdfIn PDF document text
    • http://lawaval.rf.gd/vibamel.pdfIn PDF document text
    • http://suzurexitumafod.epizy.com/example_internship_report_accounting_student.pdfIn PDF document text
    • http://bumojito.rf.gd/where_can_i_donate_mens_dress_clothes.pdfIn PDF document text
    • http://bitezopunofiwu.rf.gd/properties_of_adjoint_of_a_matrix.pdfIn PDF document text
    • http://pixagikaw.epizy.com/team_meeting_agenda_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/96009180740.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/numero_de_paginas_del_libro_un_monstruo_viene_a_verme.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/10408896616.pdfIn PDF document text
    • http://volenivojox.epizy.com/iniciao_ao_candombl.pdfIn PDF document text
    • http://fopujokites.rf.gd/zowawovobumixulezotukas.pdfIn PDF document text
    • http://wawukekaxemiju.epizy.com/pukogukatezavigemikivu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD488 5148 bytes
SHA-256: a2077b937851f1f6a9ee92eb9ce4c956efaeb444933a640edb87f0981fdb9cb0
font_01_sfnt_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 11624 bytes
SHA-256: 0d8ab7284e4afe7196a602597915baf87ef940bb685a658c517470be44394de7

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